title: Recurrent and prolonged frontal sinusitis.
mesh_terms: D002908:Chronic Disease; D004724:Endoscopy; D005260:Female; D005626:Frontal Sinus / Q000601:surgery*; D015522:Frontal Sinusitis / Q000601:surgery*; D006801:Humans; D008297:Male; D015999:Multivariate Analysis; D011379:Prognosis; D011446:Prospective Studies; D012008:Recurrence; D012086:Reoperation; D012189:Retrospective Studies; D012307:Risk Factors; D016896:Treatment Outcome